My door locks stopped working so I started by checking the vac pump. The motor runs but there is no vacumn or pressure. I'm guessing there is a bad diaphragm. Can these be repaired?
Does anyone have a pump they want to sell?

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1983 300SD
200000miles

I took mine apart from my 81 300SD. It was working beforehand but I just wanted to look. I understand completely the inside workings and can send you pictures and an explanation. However it never worked again so I bought a used one from a CA group (something like SVMB.com but I will look it up for you). Got it and it works like a charm.

I still do not know why mine did not work after carefully putting it back together. Get the exact part number from your pump and email that plus a picture to these guys. The first pump they sent was one number off and would not work. The second pump was also one number off and was shaped a bit different from my original but it works fine. I just had to stuff it into the rubber pad next to the spare. Ask to talk to Marc; he is a good guy.

Adrain

Your pump is the piston type and a rebuild kit is available here at a reasonable price from the parts dept. (top of the page) The check valve where the vacuum line enters the pump is often the culprit.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

Pick and Pull in Windsor (Arata Lane exit from the Redwood Highway, just west of the freeway on the frontage road) has several SDs that may have usable pumps in them. Go get one.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970